King Fahd University of Petroleum and Minerals
Chemistry Department
CHEM 101
Second Major
Term: 072
Tuesday, May 06, 2008
Name: _______________________
ID: _______________________
Code: 1
Q1.
Which is the correct order of decreasing ionic radius?
A)
B)
C)
D)
E)
I- > Te2- > Cs+ > Ba2+ > Ca2+
Te2- > I- > Cs+ > Ca2+ > Ba2+
I- > Te2- > Ca2+ > Ba2+> Cs+
Te2- > I- > Cs+ > Ba2+ > Ca2+
Ca2+ > Ba2+ > Cs+ > I- > Te2-
Q2.
The correct electron configuration for Te2- is,
A)
B)
C)
D)
E)
[Kr] 5s24d105p6
[Ne] 3s2 3p4
[Ar] 4s23d104p2
[Ar] 4s23d104p6
[Kr] 5s24d10
Q3.
Which of the following molecules have similar Lewis structure?
I. CH4
II. SF4 III. XeF4 IV. TeCl4
A)
B)
C)
D)
E)
I and IV
I and III
I and II
I, II, and III
II and IV
Q4.
When 3.95 g of C2H5OH (ethanol) is burned in a bomb calorimeter, the temperature in
the bomb rises from 19.75°C to 28.67°C. The calorimeter heat capacity is 13.24
kJ/°C. The heat for the combustion for one mole of C2H5OH is,
A)
B)
C)
D)
E)
–1.38×103 kJ/mol
+1.38×103 kJ/mol
–10.1 kJ/mol
+29.9 kJ/mol
–29.9 kJ/mol
Q5.
Which of the following atoms has the most exothermic electron affinity?
A)
B)
C)
D)
E)
Li
Ga
Br
P
S
Q6.
Calculate the de Broglie wavelength of a neutron moving at 1.00% of the speed of
light. (mass of neutron = 1.675 x 10-27 kg)
A)
B)
C)
D)
E)
1.32  1013 m
2.70  10–13 m
2.46  10-9 m
4.07  1011 m
5.43  1012 m
Q7.
Use the following bond energies to estimate the enthalpy change for the reaction of
one mole of CH4 with chlorine gas to give CH3Cl and hydrogen chloride.
Bond Energy (CH) = 414 kJ/mol
Bond Energy (CCl) = 326 kJ/mol
Bond Energy (HCl) = 432 kJ/mol
Bond Energy (ClCl) = 243 kJ/mol
A)
B)
C)
D)
E)
101 kJ
+106 kJ
106 kJ
+331 kJ
+101 kJ
Q8.
Which of the following statements about quantum theory is incorrect?
A) Lower energy orbitals are filled with electrons before higher energy orbitals.
B) When filling orbitals of equal energy, two electrons will occupy the same orbital
before filling a new orbital.
C) The angular momentum quantum number is related to the shape of atomic
orbitals.
D) No two electrons can have the same set of four quantum numbers.
E) The energy and position of an electron cannot be determined simultaneously.
Q9.
In the ground state of cadmium, Cd, the total number of electrons that have ml =  1
would be,
A)
B)
C)
D)
E)
24
10
18
20
6
Q10.
Arrange the following in order of increasing first ionization energy.
F, K, P, Ca, and Ne.
A)
B)
C)
D)
E)
K< Ca < F < P < Ne
Ne < K < F < Ca < P
K < P < Ca < F < Ne
Ne < F < P < Ca < K
K < Ca < P < F < Ne
Q11.
Which of the following contains the most polar bond?
A)
B)
C)
D)
E)
F2
BF3
BeF2
NF3
CF4
Q12.
Which molecule listed below has the most exothermic lattice energy?
A)
B)
C)
D)
E)
NaCl
Li2O
Na2S
KCl
K2O
Q13.
A mixture contains 0.0446 moles of two gases, ethane (C2H6) and propane (C3H8).
Upon complete combustion of the mixture at constant pressure, 82.58 kJ of heat is
released. If the enthalpy changes of combustion of ethane and propane are –1560
kJ/mol and –2221 kJ/mol respectively, the mole percent of ethane in the mixture is,
A)
B)
C)
D)
E)
44%
56%
33%
66%
74%
Q14.
A process is carried out on a CH4 gas sample inside a cylinder at constant pressure.
During the process, the internal energy for CH4 increases and the enthalpy decreases.
Which statement of the following is better describing the process?
A)
B)
C)
D)
E)
CH4 loses heat and expands during the process.
CH4 loses heat and being compressed during the process.
CH4 loses heat but its volume does not change during the process.
CH4 absorbs heat and expands during the process.
CH4 absorbs heat and being compressed during the process.
Q15.
Using Hess’s law, calculate ΔH° for the reaction,
FeO(s) + CO(g)  Fe(s) + CO2(g)
from the following data.
Fe2O3(s) + 3CO(g)  2Fe(s) + 3CO2(g)
3FeO(s) + CO2(g)  Fe3O4(s) + CO (g)
3Fe2O3(s) + CO(g)  2Fe3O4(s) + CO2(g)
A)
B)
C)
D)
E)
ΔH°= – 23 kJ
ΔH°= – 18 kJ
ΔH°= – 39 kJ
+ 11 kJ
– 66 kJ
+ 66 kJ
– 11 kJ
– 80 kJ
Q16.
In the hydrogen atom, how many orbitals are possible for n = 2?
A)
B)
C)
D)
E)
6
2
4
8
3
Q17.
A mixture of 2.0 g methane (CH4) gas, 1.0 g argon (Ar) gas and 0.50 g hydrogen (H2)
gas is in a 1.0 L container at 20°C. The average kinetic energy for the mixture is,
A)
B)
C)
D)
E)
3.7×103 J.
1.0×102 J.
13×103 J.
1.5×103 J.
7.3×103 J.
Q18.
Which of the following is incorrect?
A) The energy of matter is not continuous and is actually quantized.
B) The atomic spectrum of hydrogen is an absorption spectrum.
C) Electromagnetic radiation can be thought of as a stream of particles called
photons.
D) The atomic spectrum of hydrogen is an emission spectrum.
E) Energy can only occur in discrete units called quanta.
Q19.
A photon of visible light (  400 to 700 nm) has sufficient energy to excite an
electron in a hydrogen atom from,
A)
B)
C)
D)
E)
n = 1 to n = 3 energy state.
n = 2 to n = 6 energy state.
n = 1 to n = 5 energy state.
n = 1 to n = 6 energy state.
n = 1 to n = 2 energy state.
Q20.
Calculate the lattice energy for KCl, from the following data.
K(s) + ½ Cl2 (g) →
K (g) + Cl (g)
K (g) + Cl (g) → K+ (g) + Cl- (g)
Heat of formation, ΔHfo [KCl (s) ]=  425 kJ/mol
A)
B)
C)
D)
E)
-704 kJ/mol
-146 kJ/mol
-286 kJ/mol
-564 kJ/mol
286 kJ/mol
ΔH = 209 kJ
ΔH = 70 kJ